I see the company you bought the kit from provides a guide on its web site.

The guide include advice on construction, and selecting a transformer; it says

"This shows that transformers with 18-22V secondaries are well within reason for many common commercial and DIY speakers. A transformer with 25V transformer secondaries can also be successfully with less of a safety factor."

By the way, it also has advice on heatsinks (heatsinks are not supplied with the kit, but you will need them.)

"The last consideration for chassis construction is heatsinking. This amplifier does not require huge heatsinks. Successful implementations have used computer heatsinks without fans, solid pieces of bar stock or aluminum angle and others rely on standard large heatsinks. An aluminum plate around 3” x 3” x ½” should be plenty for most applications if allowed to circulate in free air."

so you say that 200VA will be enough for a two channel Amplifier? and i should go with like 20-25 volts secondary voltage??? i shouldn'T have any problems? i just need to find an online store that sells some and that accepts Paypal! or someone who has one of them or one that could work who's going to sell it to me

I want to do (2) LM3886, (1) LM3875, and (1) LM4700 from one transformer... Now the 4700 is the killer, I want 22V for it, not 24V... Technically, 24V should be ok, but I don't want to cut it that close.

Any suitable transformers (300-400VA) in the $50 range? Plitron is $62.95 for 300VA and $72.31 for 400VA, which is more than I want to spend. The 330VA Avel from PE would be great, but it's not available in voltages I want..

Should I just go for 24V and use a couple of extra diodes for just the 4700? I'd prefer not to do that, but if it's my only option without paying $20 extra each for a minimum of 2...